Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:40:35 2013

Optimize a model with 320 rows, 6120 columns and 57310 nonzeros
Presolve removed 10 rows and 10 columns
Presolve time: 0.12s
Presolved: 310 rows, 6110 columns, 52300 nonzeros
Variable types: 6020 continuous, 90 integer (90 binary)

Root relaxation: objective 2.162324e+04, 163 iterations, 0.01 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0 21623.2446    0    6          - 21623.2446     -      -    0s
     0     0 21623.4910    0    6          - 21623.4910     -      -    0s
     0     0 21623.4910    0    6          - 21623.4910     -      -    0s
     0     2 21624.4227    0    6          - 21624.4227     -      -    0s
*   19    11              19    21760.951328 21632.7630  0.59%   5.9    1s
*   38    13              15    21760.471674 21634.3906  0.58%   4.8    1s
H   54    18                    21760.389597 21735.8450  0.11%   4.2    1s
*   89    20              17    21760.067032 21747.1048  0.06%   3.6    1s
*  107    24              15    21759.414829 21747.1245  0.06%   3.4    1s
*  122    30              17    21759.395167 21747.1763  0.06%   3.3    1s
*  279    45              17    21759.264724 21752.1532  0.03%   2.9    1s
*  280    40              17    21759.206952 21752.1532  0.03%   2.9    1s

Cutting planes:
  Flow cover: 3

Explored 320 nodes (1190 simplex iterations) in 1.43 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.175920695233e+04, best bound 2.175709082148e+04, gap 0.0097%